From 674417bb3331e2f6bb8fbe569960da55645a20d0 Mon Sep 17 00:00:00 2001
From: YAMAMOTO Takashi <yamamoto@midokura.com>
Date: Mon, 9 Mar 2020 19:38:21 +0900
Subject: [PATCH] Don't actually send a signal with signo 0

As stated by standards.
---
 sched/signal/sig_dispatch.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sched/signal/sig_dispatch.c b/sched/signal/sig_dispatch.c
index 1e9f53107d..013d1440c8 100644
--- a/sched/signal/sig_dispatch.c
+++ b/sched/signal/sig_dispatch.c
@@ -310,6 +310,13 @@ int nxsig_tcbdispatch(FAR struct tcb_s *stcb, siginfo_t *info)
 
   DEBUGASSERT(stcb != NULL && info != NULL);
 
+  /* Don't actually send a signal for signo 0. */
+
+  if (info->si_signo == 0)
+    {
+      return OK;
+    }
+
   /************************** MASKED SIGNAL ACTIONS *************************/
 
   masked = (bool)sigismember(&stcb->sigprocmask, info->si_signo);